1 /* Copyright (C) 2009-2021 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 2.1 of the License, or (at your option) any later version. 8 9 The GNU C Library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library. If not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #include <stdio.h> 19 #include <signal.h> 20 #include <sysdep.h> 21 #define __longjmp ____longjmp_chk 22 #define CHECK_SP(sp) \ 23 do { \ 24 register unsigned long this_sp asm ("sp"); \ 25 if ((unsigned long) (sp) < this_sp) \ 26 { \ 27 stack_t oss; \ 28 int result = INTERNAL_SYSCALL_CALL (sigaltstack, NULL, &oss); \ 29 if (!INTERNAL_SYSCALL_ERROR_P (result) \ 30 && ((oss.ss_flags & SS_ONSTACK) == 0 \ 31 || ((unsigned long) oss.ss_sp + oss.ss_size \ 32 - (unsigned long) (sp)) < oss.ss_size)) \ 33 __fortify_fail ("longjmp causes uninitialized stack frame"); \ 34 } \ 35 } while (0) 36 37 #include <__longjmp.c> 38